Yes my Brianna has this. They are also called Rodent Ulcers. They are an inflammation usually around the lip area. The lip gets swollen and nasty looking...if left untreated they can become ulcerated and raw. They are not serious in that they won't kill the cat but you do want to treat for them. Research has also found that the same inflammations occur in the esophagus and intestinal system. Very similar to Irritable Bowel Syndrome. This causes frequent vomiting and diarrhea. They need to be treated with an anti-inflammatory steroid when there is a flare up. For Brianna this is about every 6 to 12 weeks or so. I am now giving her 5 mg of oral Pred for about a week when she has a flare up. The episodes seem to be brought on by stress also. My first cat Smokey would get a couple but there would be long periods, even years between them. Brianna gets them on a pretty regular basis.

Here is a link with some information also.

http://www.vetinfo.com/ceosinophilic.html

Denyce